BFD tracking support VRRP groups in eBGP (non-VLT Domain)
BFD tracking support VRRP groups in eBGP (non-VLT Domain)
-
VRRP supports tracking BFD session objects in addition to tracking interface state objects. Create a track object and configure a BFD session.
Standard use case with BFD session tracking object under VRRP running eBGP protocol in non-VLT deployment. A server/host connects to a Layer 2 switches with two upstream connections toward Leaf 1 and Leaf 2 with VRRP group 50 (Active/Standby) in Figure 15. The BFD session tracking under VRRP group takes place on the connection between Leaf and spine in Layer 3, BFD is supported on static and dynamic routing protocols, such as static route, OSPFv2, OSPFv3, and BGP.
- Enable BFD in BGP on Leaf 1 and Leaf 2.
- Establish BGP ASN assignment.
- Establish BFD sessions with all neighbors.
- Create a BFD track number 10 to define the tracking of Ethernet 1/1/53 vrf default source-ip-address 192.168.1.1 neighbor-ip-address 192.168.1.0 on Leaf 1.
- Create a BFD track number 10 to define the tracking of ethernet 1/1/53 vrf default source-ip-address 192.168.1.3 neighbor-ip-address 192.168.1.2 on Leaf 2.
- Associate the BFD track number 10 into VRRP group on its VLAN 50 with higher priority 150 as control.
- Associate the BFD track number 10 into VRRP group on its VLAN 50 with lower priority 140 as Standby.
Figure 16. Layer 2 switches with two upstream connections toward Leaf 1 and Leaf 2 under VRRP group 50 with BFD session tracking object in layer 3 leaf-spine
Peer 1 (Leaf 1)
Peer 2 (Leaf 2)
bfd enable
router bgp 64701
bfd all-neighbors interval 200 min_rx 200 multiplier 6 role active
Track 10
bfd interface Ethernet 1/1/53 vrf default source-ip-address 192.168.1.1 neighbor-ip-address 192.168.1.0 interval 50 min_rx 50 multiplier 5 role active
configure terminal
interface vlan 50
vrrp-group 50
priority 150
track 10 priority-cost 60
bfd enable
router bgp 64702
bfd all-neighbors interval 200 min_rx 200 multiplier 6 role active
Track 10
bfd interface Ethernet 1/1/53 vrf default source-ip-address 192.168.1.3 neighbor-ip-address 192.168.1.2 interval 50 min_rx 50 multiplier 5 role active
configure terminal
interface vlan 50
vrrp-group 50
priority 140
track 10 priority-cost 60
Note: Configure track objects under a VRRP group. A a maximum of four track objects can be configured under a VRRP group. The VRRP group priority value must be less than or equal to the priority cost value.
Note: The priority admin on Leaf 2 for secondary peer has to be lower than primary’s value or default 100, in this case, the secondary’s priority value is 140.
Leaf1# show track brief
TrackID Resource Parameter Status LastChange
----------------------------------------------------------------------------------
10 BFD session ethernet1/1/653:default UP 2022-06-02T10:04:11Z6
src-ip 192.168.1.1
neighbor-ip 192.168.1.0
Leaf1# show running-configuration interface vlan 50
!
interface vlan50
no shutdown
IP address 172.16.1.1/24
!
vrrp-group 50
priority 150
track 10 priority-cost 60
virtual-address 172.16.1.254
Leaf1# show vrrp 50
Interface : vlan50 IPv4 VRID : 50
Version : 3 State : master-state
Primary IP : 172.16.1.254 Master IP : 172.16.1.1
Virtual MAC : 00:00:5e:00:01:32 Accept Mode : true
Admin Priority : 150 Operational Priority : 150
Advertise Interval(in centi secs) : 100
Preempt Status : true Hold Time : 0
Virtual IP address :
172.16.1.254
master-transitions : 3 advertise-rcvd : 1343
advertise-interval-errors : 0 ip-ttl-errors : 0
priority-zero-pkts-rcvd : 0 priority-zero-pkts-sent : 0
invalid-type-pkts-rcvd : 0 address-list-errors : 0
pkt-length-errors : 0
omit-skew-time : no
Tracking states for resource Ids:
10 - Up BFD, ethernet1/1/53, priority-cost 60, source-ip: 192.168.1.1, neighbor-ip: 192.168.1.0, VRF:default